'use strict';

const { parseXML, childAttr, required } = require('../parser');
const { createDoc, energyInteropNs } = require('../shared');

async function parse(input) {
  const json = await parseXML(input);
  const o =
    json['oadrPayload']['$$']['oadrSignedObject'][0]['$$']['oadrPoll'][0]['$$'];

  return {
    _type: 'oadrPoll',
    venId: required(childAttr(o, 'venID'), 'venID'),
  };
}

function serialize(obj) {
  const doc = createDoc()
    .ele('@oadr2b', 'oadr2b:oadrPayload')
    .ele('oadr2b:oadrSignedObject')
    .ele('oadr2b:oadrPoll')
    .att(energyInteropNs, 'ei:schemaVersion', '2.0b')
    .ele(energyInteropNs, 'ei:venID')
    .txt(obj.venId)
    .up()
    .doc();
  return doc.end({ headless: true, prettyPrint: false });
}

async function canParse(input) {
  const json = await parseXML(input);
  const o = json['oadrPayload']['$$']['oadrSignedObject'][0]['$$'];
  return o['oadrPoll'] != null;
}

function canSerialize(message) {
  return message._type === 'oadrPoll';
}

module.exports = {
  parse,
  serialize,
  canParse,
  canSerialize,
};